Warning: this guide is so long I had to split it into multiple posts. Read the four questions and explanations below to see if you're interested in reading the rest.
WHAT IS THIS?
This is intended as guide to good design practice for clothing, jewellery, and custom artefacts, and as a sort of revision guide for item descriptions in those categories. It is NOT concerned with grammar or the approval process. You can get designs approved while following none of this advice. It is also not about cooking design practices, because I don't think I'm qualified to give advice on that. Also, THERE WILL BE NO DISCUSSION OF COMMAS.
DID ANYONE ASK FOR YOUR ADVICE?
No, and I do realize that.
WHY DID YOU MAKE THIS?
Because I like wandering around shops and looking at all the cool things people make, and because I think I can be helpful in this regard. I work as an editor IRL, and have been crafting things in Achaea for nearly a decade. It's a learning process. I have a word document which has my designs from the very start, and a lot of them are flat-out terrible. My newer ones are better, but I'm sure I'll look back on them someday and wince.
IS THERE A TL;DR?
Sort of/not really. If you're interested in these design tips but your eyes are starting to water considering the sheer length of this guide (mine are, and I wrote the thing), I'd suggest just reading the 'Things to Do' list below and skipping the 'Things to Avoid' section. It's a lot shorter and you'll get -some- of the same things from it. However, I do very strongly recommend reading the Things to Avoid, in installments if necessary. There is a lot of detail in there.
So, without further ado...